Abstract: In order to improve the system speed and signal quality,reform the systematic controllability,and reduce the costs,the author  utilizes Field Programmable Gate Array  FPGA chip EP1K30TC-144 to realize the Direct Digital Frequency Synthesis  (DDS ).The author states the  principle of DDS and the ideas for its design in FPGA,gives the optimization and implementation methods,and describes the circuit structure.The VHDL sourse program that DDS is formed is provided;thus the shortcomings of the limit frequency band range of the special purpose DDS chip and the stray and great output are overcome.

Key words: Direct Digital Frequency Synthesis, FPGA, EP1K30TC-144